Keystones — Capstone
Five GCSE retrieval questions · 10 January 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² + 5x + 4
Answer: (x + 5⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 13cm, angle = 43°. Give your answer to 2 decimal places
Answer: 62.06cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 5:45:72 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 67, 17, 91, 25, 25, 93, 77, 52
Answer: Mean = 56, Median = 57, Range = 76